Luminescence from impurities and radiation defects in CdSe and CdS

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Abstract
CdSe and CdS platelets annealed in NaCl atmosphere show strong emission attributed to donor‐acceptor pair recombination with chlorine as a substitutional donor and sodium as a substitutional acceptor. Upon irradiation with fast neutrons, CdSe : NaCl platelets exhibit a new emission band centered at about 7050 Å. Chlorine‐doped CdSe platelets show a weak emission band at the same wavelengths, whose strength increases upon irradiation with neutrons. It is suggested that this new emission also arises from donor‐acceptor pair recombination with the donor being a substitutional chlorine and the acceptor a cadmium vacancy associated with a substitutional chlorine.